#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>

int main()
{
    printf("I'm running....\n");
    pid_t id = fork();
    if(id == 0)
    {//child
        int count = 5;
        while(count)
        {
            printf("child,PID:%d,PPID:%d,count:%d\n",getpid(),getppid(),count);
            sleep(1);
            count--;
        }
        printf("child quit...\n");
		exit(1);
    }
    else if(id>0)
    {
        while(1)
        {
            printf("father...PID:%d, PPID:%d\n", getpid(), getppid());
			sleep(1);
        }

    }
    else 
    {

    }

    return 0;
}
